\begin{table}[htbp]\centering
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\caption{Logarithm Grid table\label{log\_G}}
\begin{tabular}{l*{8}{c}}
\hline\hline
            &\multicolumn{1}{c}{(1)}&\multicolumn{1}{c}{(2)}&\multicolumn{1}{c}{(3)}&\multicolumn{1}{c}{(4)}&\multicolumn{1}{c}{(5)}&\multicolumn{1}{c}{(6)}&\multicolumn{1}{c}{(7)}&\multicolumn{1}{c}{(8)}\\
            &\multicolumn{1}{c}{log\_fe2\_R}&\multicolumn{1}{c}{log\_fe2\_H}&\multicolumn{1}{c}{log\_fe2\_W2}&\multicolumn{1}{c}{log\_fe2\_W4}&\multicolumn{1}{c}{log\_fe2\_W6}&\multicolumn{1}{c}{log\_fe2\_O2}&\multicolumn{1}{c}{log\_fe2\_O4}&\multicolumn{1}{c}{log\_fe2\_O6}\\
\hline
log\_L3\_sd   &       0.313\sym{***}&       0.341\sym{***}&       0.341\sym{***}&       0.328\sym{***}&       0.319\sym{***}&       0.319\sym{***}&       0.332\sym{***}&       0.340\sym{***}\\
            &     (0.063)         &     (0.062)         &     (0.065)         &     (0.062)         &     (0.062)         &     (0.062)         &     (0.063)         &     (0.060)         \\
log\_R\_L3\_sd &       0.199\sym{***}&                     &                     &                     &                     &                     &                     &                     \\
            &     (0.060)         &                     &                     &                     &                     &                     &                     &                     \\
log\_H\_L3\_sd &                     &       0.128\sym{***}&                     &                     &                     &                     &                     &                     \\
            &                     &     (0.040)         &                     &                     &                     &                     &                     &                     \\
log\_W2\_L3\_sd&                     &                     &       0.100\sym{***}&                     &                     &                     &                     &                     \\
            &                     &                     &     (0.035)         &                     &                     &                     &                     &                     \\
log\_W4\_L3\_sd&                     &                     &                     &       0.147\sym{***}&                     &                     &                     &                     \\
            &                     &                     &                     &     (0.045)         &                     &                     &                     &                     \\
log\_W6\_L3\_sd&                     &                     &                     &                     &       0.172\sym{***}&                     &                     &                     \\
            &                     &                     &                     &                     &     (0.054)         &                     &                     &                     \\
log\_O2\_L3\_sd&                     &                     &                     &                     &                     &       0.235\sym{***}&                     &                     \\
            &                     &                     &                     &                     &                     &     (0.071)         &                     &                     \\
log\_O4\_L3\_sd&                     &                     &                     &                     &                     &                     &       0.154\sym{***}&                     \\
            &                     &                     &                     &                     &                     &                     &     (0.055)         &                     \\
log\_O6\_L3\_sd&                     &                     &                     &                     &                     &                     &                     &       0.132\sym{**} \\
            &                     &                     &                     &                     &                     &                     &                     &     (0.056)         \\
\hline
r2          &       0.892         &       0.889         &       0.888         &       0.891         &       0.891         &       0.892         &       0.889         &       0.888         \\
\hline\hline
\multicolumn{9}{l}{\footnotesize Standard errors in parentheses}\\
\multicolumn{9}{l}{\footnotesize \sym{*} \(p<0.10\), \sym{**} \(p<.05\), \sym{***} \(p<.01\)}\\
\end{tabular}
\end{table}
